The reasonableness or axiom of reason is often taken for granted. We do not seek the cause or source of reason’s reasonableness, instead we use it without a basis for using it. Is that reasonable? In the case of the atheist—who claims that science and reason is the only source of truth, how does he come to the truth value of science and reason? Surely science is not used to show its own scientificness, and surely reason is not used to show its own reasonableness. That would be begging the question. The fact that we know the difference between the reasonable and the unreasonable, assumes a truth value to it. It assumes that reason is an axiom. (This is an excerpt from The Epistemological Argument)
I would argue that only God can be the basis for the axiom of reason. I have defended this view in my essay: Reason Assumes a God (The Epistemological Argument).
Challenge: The atheist is to provide a defeater to my argument and also provide a basis for reason.